LP3133 Datasheet, PDF (2/5 Pages) Lowpower Semiconductor inc – PWM tuned LED brightness through PWM pin(200Hz-10KHz)

Preliminary Datasheet
Functional Pin Description
Part No.
Package Type
Pin Configurations
LP3133
LP3133
QFN-16
VIN 13
GND 14
EN 15
EN 16
PGND
8 VOUT
7 PGND
6 LED1
5 LED2
PIN
NAME
DESCRIPTION
QFN-16
1,2,9,10,11,12
3
4
5
6
7/14
8
13
15/16
NC
No Internal Connection.
LED4 LED4 cathode terminal.
LED3 LED3 cathode terminal.
LED2 LED2 cathode terminal.
LED1 LED1 cathode terminal
PGND/GND Ground.
Vout
Output Voltage Source for connection to the LED anodes.
VIN
EN/PWM
Power Supply.
Chip Enable(active High).and connects to a GPIO of MCU,the GPIO
supply a PWM singal dimming method to control the brightness(0-20mA) of
white LEDs and the PWM frequency from 200Hz to 10KHz,the duty from
0% to 100%.the typical frequency is 2KHz.
Function Block Diagram
LP3133 – Ver. 1.0 Datasheet Feb.-2008
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